This apparently exposes (what I think is) a subtle bug in cygwin's handling of subst'd drives. Let's just drop the hackery and use a tempfile, which should always work. Also, introduce a proper die() function which replaces previous hand-rolled error+exit pattern, but which wrote to stdout. --- contrib/updpkgsums.sh.in | 37 +++++++++++++++++++++++-------------- 1 file changed, 23 insertions(+), 14 deletions(-) diff --git a/contrib/updpkgsums.sh.in b/contrib/updpkgsums.sh.in index e0524bd..a40845b 100644 --- a/contrib/updpkgsums.sh.in +++ b/contrib/updpkgsums.sh.in @@ -40,6 +40,11 @@ version() { echo 'Copyright (C) 2012-2013 Dave Reisner ' } +die() { + printf "==> ERROR: $1\n" "${@:2}" >&2 + exit 1 +} + case $1 in -h|--help) usage; exit ;; -V|--version) version; exit ;; @@ -47,8 +52,7 @@ esac buildfile=${1:-PKGBUILD} if [[ ! -f $buildfile ]]; then - printf "==> ERROR: %s not found or is not a file\n" "$buildfile" - exit 1 + die "%s not found or is not a file" "$buildfile" fi # Resolve any symlinks to avoid replacing the symlink with a file. But, we @@ -71,18 +75,19 @@ fi # Check $PWD/ for permission to unlink the $buildfile and write a new one if [[ ! -w . ]]; then - printf "==> ERROR: No write permission in '%s'\n" "$PWD" - exit 1 + die "No write permission in '%s'" "$PWD" fi -{ - # Generate the new sums and try to unlink the file before writing stdin back - # into it. This final precaution shouldn't fail based on the previous checks, - # but it's better to be extra careful before unlinking files. - export BUILDDIR=$(mktemp -d --tmpdir updpkgsums.XXXXXX) - trap "rm -rf '$BUILDDIR'" EXIT - newsums=$(makepkg -g -p "$buildfile") && rm -f "$buildfile" && - awk -v newsums="$newsums" ' +# Generate the new sums +export BUILDDIR=$(mktemp -d --tmpdir updpkgsums.XXXXXX) +newbuildfile=$(mktemp --tmpdir updpkgsums.XXXXXX) + +# In case the eventual replacement fails, we don't want to leave behind +# $newbuildfile as garbage in $TMPDIR. This fails silently if the replacement +# succeeds. +trap "rm -rf '$BUILDDIR' '$newbuildfile'" EXIT +newsums=$(makepkg -g -p "$buildfile") && +awk -v newsums="$newsums" ' /^[[:blank:]]*(md|sha)[[:digit:]]+sums(_[^=]+)?=/,/\)[[:blank:]]*(#.*)?$/ { if (!w) { print newsums @@ -93,7 +98,11 @@ fi 1 END { if (!w) print newsums } - ' > "$buildfile" -} < "$buildfile" +' "$buildfile" > "$newbuildfile" + +# Replace the original buildfile. +if ! mv -- "$newbuildfile" "$buildfile"; then + die "Failed to update %s. The file has not been modified." "$buildfile" +fi # vim: set noet: -- 2.1.3